【摘要】Based on a new panel data, we find a very significant and robust empirical relation:government debt is harmful to longrun economic growth.After controlling a few veriables emphasized by economic growth literature, the higher government debtGDP ratio is, the lower longrun economic growth rate is.This kind of negative effect of government debt is more obvious in developing countries,and may come from the fluctuation of government debtGDP ratio.We also find a few familiar results on economic growth empirical research:there is conditional convergence to some extent, total investmentGDP ratio and life expectancy is positive to economic growth,etc.